2.6.2 Environment Variables for the Runtime System
These environment variables are referred to by the runtime system.
     
- HOME- HOMEDRIVE- HOMEPATH
- Directory in which to look for init files.  E.g. c:\users\joe
or /home/joe.  Under Windows, the environment variables
HOMEDRIVE and HOMEPATH, set by the operating system, are
used instead.  Under unix, HOME is set by the login shell.
     
 
- TMPDIR- TEMP- TMP
- Directory for various temporary files.  The variables are tried in the
given order.  If none of them is suitable, built-in defaults are used:
under unix, /var/tmp, /usr/tmp, /tmp; under
Windows, \temp, \tmp, and \ (all on the system
drive).
     
 
- MITSCHEME_INF_DIRECTORY
- Directory containing the debugging information files for the Scheme
system.  Should contain subdirectories corresponding to the
subdirectories in the source tree.  For example, if its value is
f:\random, runtime system debugging files will be expected in
f:\random\runtime, while Edwin debugging files will be expected
in f:\random\edwin.  By default, the information is searched
for on the library path.
     
 
- MITSCHEME_LOAD_OPTIONS
- Specifies the location of the options database file used by the
load-optionprocedure.  The default is  optiondb.scm on
the library path.